/// <summary>
/// C转码字符串，根据 模式 参数.
/// </summary>
/// <param name="src">源字符串.</param>
/// <param name="mode">模式.</param>
/// <returns>返回该字符串的转义.</returns>
public static string EscapeString(string src, StringEscapeCMode mode)
{
if (string.IsNullOrEmpty(src))
{
return(src);
}
if ((mode & StringEscapeCMode.QuoteMask) == StringEscapeCMode.NoEscape)
{
return(src);
}
StringBuilder sb = new StringBuilder();
bool hasescape = false;
foreach (char ch in src)
{
string s = EscapeChar_OnlyS(ch);
if (null != s)
{
sb.Append(s);
hasescape = true;
}
else
{
sb.Append(ch);
}
}
bool hasquote = ((mode & StringEscapeCMode.QuoteMask) == StringEscapeCMode.QuoteYes);
if ((mode & StringEscapeCMode.QuoteMask) == StringEscapeCMode.QuoteAuto && hasescape)
{
hasquote = true;
}
if (!hasescape && !hasquote)
{
return(src);
}
if (hasquote)
{
sb.Insert(0, "\"");
sb.Append('"');
}
return(sb.ToString());
}
/// <summary>
/// C转码字符，根据 模式 参数.
/// </summary>
/// <param name="ch">字符.</param>
/// <param name="mode">模式.</param>
/// <returns>返回该字符的转义.</returns>
public static string EscapeChar(char ch, StringEscapeCMode mode)
{
if ((mode & StringEscapeCMode.QuoteMask) == StringEscapeCMode.NoEscape)
{
return(ch.ToString());
}
string rt = EscapeChar_Only(ch);
bool hasquote = ((mode & StringEscapeCMode.QuoteMask) == StringEscapeCMode.QuoteYes);
if ((mode & StringEscapeCMode.QuoteMask) == StringEscapeCMode.QuoteAuto && null != rt)
{
hasquote = true;
}
if (null == rt)
{
rt = ch.ToString();
}
if (hasquote)
{
rt = string.Format("'{0}'", rt);
}
return(rt);
}
/// <summary>
/// 解转义字符串.
/// </summary>
/// <param name="src">源字符串.</param>
/// <param name="mode">模式.</param>
/// <returns>返回该字符串的解转义.</returns>
public static string UnescapeString(string src, StringEscapeCMode mode)
{
if (string.IsNullOrEmpty(src))
{
return(src);
}
Debug.Assert(mode == StringEscapeCMode.Default, "Now only support StringEscapeCMode.Default!"); //TODO: 支持更多的C转义的解码.
StringBuilder sb = new StringBuilder(src.Length);
char[] arr = src.ToCharArray();
bool bQuoteIn = false; // 已经进入括号内.
bool bBackslash = false; // 前一个是反斜杠.
long posBackslash = 0; // 反斜杠的位置.
for (int i = 0; i < arr.Length; ++i)
{
bool bOutChar = true; // 输出当前字符.
char ch = arr[i];
if (bQuoteIn)
{
if (bBackslash)
{
switch (ch)
{
case '\\':
case '\"':
case '\'':
// 输出ch.
break;
case '0': ch = '\0'; break;
case 'a':
case 'A': ch = '\a'; break;
case 'b':
case 'B': ch = '\b'; break;
case 'f':
case 'F': ch = '\f'; break;
case 'n':
case 'N': ch = '\n'; break;
case 'r':
case 'R': ch = '\r'; break;
case 't':
case 'T': ch = '\t'; break;
case 'v':
case 'V': ch = '\v'; break;
case 'u':
case 'U':
Debug.Assert(false, "Now not support."); //TODO: 实现unicode转码.
sb.Append('\\');
break;
default:
// 无效转义，补上前面的反斜杠.
sb.Append('\\');
break;
}
if (bOutChar)
{
bBackslash = false;
}
}
else
{
switch (ch)
{
case '\"':
bQuoteIn = false;
bBackslash = false;
bOutChar = false;
break;
case '\\':
bBackslash = true;
posBackslash = i;
bOutChar = false;
break;
default:
//bOutChar = true;
break;
}
}
}
else
{
if ('"' == ch)
{
bQuoteIn = true;
bBackslash = false;
bOutChar = false;
}
else
{
//bOutChar = true;
}
}
if (bOutChar)
{
sb.Append(ch);
}
}
if (bBackslash)
{
sb.Append(src.Substring((int)posBackslash));
}
return(sb.ToString());
}
